Standard U-Bolt, Standard U-Bolt, Steel, Finish Hot Dipped Galvanized, Thread Size 7/8 In.-9, Thread Length 4 1/4 in, Inside Length 16 1/16 in, Inside Width 12 7/8 in, Pipe Size (In.) 12 in, Characteristics ASME B18.2.2- ASTM A563 Grade A, Includes (2) Nuts